For all intents and purposes, the cover is strictly for aesthetics and perhaps best-suited for street applications, and with regards to any such cosmetic item, it's just a matter of personal taste. It can, however, allow you to easily determine if the clutch slave is disengaging the clutch when the clutch lever is depressed.

If you're getting milky more then anything it's cause the bike never got up to temperature. Go ride it 15-20 miles on a warm day it won't be milky anymore that day.

Yep that is right that if you get out for a longer haul it normally burns off for those commuting on shorter journeys won’t play.

Am toying with a similar issue at the moment of whether to get cage on dry clutch cage on the V4R. Nice novelty factor (and enhanced sound) but I worry about all the crap from the track and road getting in there.

I for one am against it but to each of it's own! I'm against it because of a subjective and objective reason. The objective one is simple as others stated before me: adds glass where it doesn't belong and if you track the bike and low side it then you risk spilling tons of oil on the track. The subjective reasons is that I like on my bike the golden combo and the clutch cover goes well with the mag rims and soon the titanium motocorse radiators protectors.